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(11) | EP 0 447 159 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | A method and apparatus for doppler velocity de-aliasing |
| (57) For real time de-aliasing of the Doppler velocity data in a weather radar system
uses a Process Radials routine (20) which processes every valid range gate along a
radar dwell by determining if each range gate is within the Nyquist velocity of either
the average of four preceding range gates or data from a Windfield Model. To further
enhance the de-aliasing process a Process Dual Scans routine (16) is used prior to
the Process Radial routine (20) to de-alias velocity data by comparing velocity data
from two scans of different pulse repetition frequencies. Subsequent to the Process
Radials routine (20), a Minimize Azimuthal Shear routine (22) checks velocity discontinuities
from azimuth to azimuth. The de-aliased data is transferred to an Update Windfield
Model routine (24) for quality checks of the de-aliased velocity data and updating
of the Windfield Model. This complete method of de-aliasing the velocity data is performed
during the real time operation of the radar system (30, Fig. 2A). |